Abstract
The (Co 41Fe 39B 20) x (SiO 2) 100− x metal–insulator granular films ( x=33, 43, 50, 72 and 100 at.%) with amorphous structure have been obtained by ion-beam sputtering technique. Resistivity and magnetoresistance have been studied in these materials. It has been observed that all the granular composites crystallize within the same temperature region 700–900 K independent of the concentration. Electrical conductance by hopping mechanism with a variable jump length is found to dominate in the (Co 41Fe 39B 20) x (SiO 2) 100− x granular composites containing less than 72 at.% of the metal phase (33, 43 and 50 at.% Co 41Fe 39B 20) at temperatures below 300 K. The negative giant magnetoresistance (GMR) was observed in the same granular composites. The maximum value of the GMR (3.4%) was found in the (Co 41Fe 39B 20) 50(SiO 2) 50 film which is close to the percolation threshold. The GMR is associated with the electron tunneling through the insulator barriers separating the ferromagnetic granules.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
